Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 119
ugh the coil U the armature V was attracted,releasing the wheel and allowing the bell of the alarum toring. The electro-magnet was placed in circuit with theline in the manner indicated in the diagram, where i and2 are the direct and return wires of the line, K is a battery,and 5 is a key… … Fig. 21. as to bring it in contact with b. Wheatstone, like Davy,experienced the difficulty of the weakening of the currentby the resistance of the line and apparatus, and by leakage,due to imperfect insulation, and he remedied it in a similarmanner by means of a relay which introduced a…
Electric industries · Electricity
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